What is an acceptable degree of error in a shutter before it needs to be CLA'd? +/- 10%? 15%? I am looking at my lenses with a homemade electronic tester and some are quite off. I have come to expect that in the faster speeds, especially in my old Universal and Synchro shutters, but what about the main speeds, say 1/2 to 1/60. How much drift is tolerable?
I b'lieve, could be mistaken, that the standard limits are +/- 30%. This is a little more than half a stop off.